Saad al-Hilli and his wife Ikbal, who were from Claygate in Surrey, and her mother Suhaila al-Allaf, who lived in Sweden, were all fatally shot on a remote forest road in Chevaline on September 5 2012.

Local cyclist Sylvain Mollier was also murdered.

The horrific scene was discovered by cyclist Brett Martin, who found Iraqi-born Mr Al-Hilli, 50, his 47-year-old dentist wife and her elderly mother blasted to death in their BMW.

The al-Hilli's first-born daughter Zainab was shot in the shoulder and beaten, but survived. Her four-year-old sister Zeena lay hidden under her mother's body and was only discovered eight hours after the murders.